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x in (-oo:+oo)
(-4/5)*x > 1/10 // - 1/10
(-4/5)*x-(1/10) > 0
(-4/5)*x-1/10 > 0
-4/5*x-1/10 > 0 // + 1/10
-4/5*x > 1/10 // : -4/5
x < 1/10/(-4/5)
x < -1/8
x in (-oo:-1/8)
(-oo:-1/8)
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